STREAMS Programming Guide

Write Options

send zero (I_SWROPT)

The write(2) mode is set using the value of the argument arg. Legal bit settings for arg are: SNDZERO--Send a zero-length message downstream when the write of 0 bytes occurs. To avoid sending a zero-length message when a write of 0 bytes occurs, this bit must not be set in arg. On failure, errno can be set to EINVAL--arg is above the legal value.